Trulock's Extended Ported Stainless Steel choke tubes are accurate, dependable, and convenient. Knurled ends allow for quickly swapping chokes for the varied ranges you may encounter. Precision machining means that your patterns are consistent and the stainless steel 17-4 construction make them the most durable chokes available. Ported design allows for faster follow up shots, with reduced recoil and muzzle rise. These chokes help you to make your shots count!